Hotkey plus Select sets in-game audio to -80

[Meyerb2008]

Hello everyone! I am completely new to RetroPie and have very little experience with things like this. I chose another key to use for the Hotkey (other than select) when initially setting up my system. While in a game (Mame emulator, Pac-Man) I inadvertently pressed my chosen hotkey and the select button together and a small message in yellow print popped up at the bottom left of the screen that simply said "Audio Volume: " and after that was a negative number. Each time I pressed it, it decremented down until it was at -80. (Coincidentally it would also toggle the fast forward feature.) Now the game audio is muted. How can I bring the volume back up.....Also, it hasn't affected any of the other volume, i.e.: the main screen still has the same volume as before and other games do as well. But each time I go back to this game the volume is muted. What can I do??

[mitu]

Please add more info about your system, as detailed in https://retropie.org.uk/forum/topic/3/read-this-first.

[Meyerb2008]

@mitu Hi. I am using a Raspberry Pi 3 B+, with an official Raspberry Pi power supply. I have a keyboard set up as my controller (for now) and will be setting up a joystick and button set I purchased from Amazon.

[mitu]

The keyboard doesn't function like a gamepad, the hotkey doesn't get set.
What image did you use to install ? RetroPie doesn't have 'Save on Exit' enabled in RetroArch, so exiting a game and re-start it again should preserve the audio volume.

[Meyerb2008]

Thank you for your very fast reply...and please forgive my ignorance...I'm quite new to this. I am not sure which version I have of RetroPie. The image is from an SD card gifted to me from my sister. When I was assigning keys for the controller, I pressed the numberpad minus button to assign a hotkey. Now when I press that button and the spacebar, which I set for "select" is when I get the little "Audio: -80" message at the bottom left of my screen.
--------EDIT------
All games in this emulator are silent, but the other emulators are at the usual volume.

[mitu]

@Meyerb2008 said in Hotkey plus Select sets in-game audio to -80:

The image is from an SD card gifted to me from my sister.

Did you sister purchase it or installed it herself ? Selling the RetroPie image is against the project's license, there are quite a number of 'sellers' doing that.

All games in this emulator are silent, but the other emulators are at the usual volume.

That's because not all emulators are the same. Press + on the keyboard to raise the volume up.

[Meyerb2008]

@mitu It was a Christmas present to me along with the Raspberry Pi, so I really don't know. In any case though, thank you very much for the help. I see that I was confused thinking I had assigned the "hotkey" button to the minus sign. Using the select and plus sign does indeed restore volume.